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Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Operating activities    
Net loss $ (27,678) $ (34,410)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation 4,520 4,218
Amortization of premium on investments 2,080 2,292
Unrealized foreign exchange gain on short-term investments (436) 0
Loss on disposal of property and equipment 0 100
Stock-based compensation 24,256 20,232
Tax benefit on unrealized gain on available-for-sale securities (371) (66)
Realized gain on sales of available-for-sale securities (37) (89)
Changes in operating assets and liabilities:    
Accounts receivable 7,713 6,080
Prepaid expenses and other current assets 23 1,289
Other assets 23 (243)
Accounts payable (4,482) (317)
Accrued liabilities 4,231 (7,611)
Deferred revenue 14,733 28,494
Lease financing liability 690 474
Other long-term liabilities 388 289
Net cash provided by operating activities 25,653 20,732
Investing activities    
Purchases of property and equipment (1,106) (1,668)
Purchases of available-for-sale securities (72) (16,683)
Proceeds from sales of available-for-sale securities 4,298 10,154
Proceeds from maturities of available-for-sale securities 12,617 14,035
Net cash provided by investing activities 15,737 5,838
Financing activities    
Repayments of lease liability (302) (302)
Cash paid for payroll taxes on restricted stock unit releases (2,242) 0
Proceeds from issuance of common stock 6,137 8,523
Net cash provided by financing activities 3,593 8,221
Effect of exchange rate change on cash and cash equivalents (24) (62)
Net increase in cash and cash equivalents 44,959 34,729
Cash and cash equivalents at beginning of period 153,324 165,455
Cash and cash equivalents at end of period $ 198,283 $ 200,184